trading levels

oil 15/6-10
trading levels lows 72,2 highs 77,6
R3 76,7
R2 76,2
R1 75,7
N VALUE 75
S1 74,4
S2 73,9
S3 73,1

This is today's levels that I use

sell as close to the highest level that is possible
buy as close to the lowest level that is possible
and sometimes it gets a little trade between levels if it feels right for the moment